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Érosion hydrique --- Water erosion --- Eau superficielle --- Surface water --- Sédiment --- Sediment --- Eutrophisation --- Eutrophication --- Phosphore --- Phosphorus --- Lessivage du sol --- Leaching --- Précipitation --- precipitation --- Type de sol --- soil types --- Expérimentation en laboratoire --- Laboratory experimentation --- Expérimentation au champ --- Field experimentation --- Mesure --- Measurement --- Belgium --- 631.432.3 --- 631.416.2 --- 631.421.1 --- Permeability. Lessivage. Leaching. Mobility of soil constituents --- Phosphoric acid --- Field experiments. Field trials --- Theses --- 631.421.1 Field experiments. Field trials --- 631.416.2 Phosphoric acid --- 631.432.3 Permeability. Lessivage. Leaching. Mobility of soil constituents --- Sediment. --- precipitation.

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Third World: agricultural and food problems --- Agriculture --- Research --- On-farm. --- Expérimentation --- experimentation --- Expérimentation au champ --- Field experimentation --- Prise de décision --- Decision making --- design --- Évaluation --- evaluation --- Méthode statistique --- Statistical methods --- 631.421.1 --- 63.001.5 <6> --- -Agriculture --- -57.087.1 --- Farming --- Husbandry --- Industrial arts --- Life sciences --- Food supply --- Land use, Rural --- Field experiments. Field trials --- Agricultural research--Afrika --- -On-farm --- Biometry. Statistical study and treatment of biological data --- 57.087.1 Biometry. Statistical study and treatment of biological data --- 63.001.5 <6> Agricultural research--Afrika --- 631.421.1 Field experiments. Field trials --- 57.087.1 --- Research&delete& --- On-farm --- experimentation. --- evaluation. --- Developing countries: agricultural and food problems --- On-farm research, Agricultural --- On-farm trials, Agricultural --- Farms --- Field experiments --- On-farm research --- Agriculture - Research - On-farm --- Agriculture - Research - Africa - On-farm